Reports:Tasks not implemented in R
From Rosetta Code
Awareness
If R is a language you like, or are interested in, please inform your fellow members of the R community; this page can't be emptied without your and their participation.
If R is a language you like, or are interested in, please inform your fellow members of the R community; this page can't be emptied without your and their participation.
Contents
Not implemented[edit]
These are currently not implemented in R. Please implement some if you can. If any tasks are not possible or too complex in R, they should not be on this list. To mark a task as such, add {{omit from|R}}, preserving the capitalization of the language, to that task. It will appear below under the "Not Considered" section.
A
- AVL tree
- Abbreviations, automatic
- Abbreviations, easy
- Abbreviations, simple
- Abelian sandpile model
- Abstract type
- Active Directory/Connect
- Active Directory/Search for a user
- Active object
- Address of a variable
- Aliquot sequence classifications
- Angle difference between two bearings
- Angles (geometric), normalization and conversion
- Animate a pendulum
- Append a record to the end of a text file
- Apply a digital filter (direct form II transposed)
- Approximate Equality
- Arena storage pool
- Arithmetic-geometric mean/Calculate Pi
- Arithmetic/Rational
- Arithmetic evaluation
- Atomic updates
- Attractive numbers
- Averages/Mean angle
- Averages/Mean time of day
B
- Balanced ternary
- Base64 decode data
- Best shuffle
- Binary strings
- Bitcoin/address validation
- Bitcoin/public point to address
- Bitmap/Bresenham's line algorithm
- Bitmap/Histogram
- Bitmap/Midpoint circle algorithm
- Bitmap/PPM conversion through a pipe
- Bitmap/Read a PPM file
- Bitmap/Read an image through a pipe
- Bitwise IO
- Box the compass
- Brace expansion
- Bulls and cows/Player
C
- CUSIP
- Calendar
- Calendar - for "REAL" programmers
- Call a foreign-language function
- Call an object method
- Canny edge detector
- Cantor set
- Carmichael 3 strong pseudoprimes
- Casting out nines
- Catalan numbers/Pascal's triangle
- Catmull–Clark subdivision surface
- Chaocipher
- Chat server
- Checkpoint synchronization
- Chinese zodiac
- Chowla numbers
- Church Numerals
- Circles of given radius through two points
- Color quantization
- Colour pinstripe/Display
- Colour pinstripe/Printer
- Combinations and permutations
- Combinations with repetitions
- Comma quibbling
- Commatizing numbers
- Compare sorting algorithms' performance
- Compile-time calculation
- Compiler/AST interpreter
- Compiler/code generator
- Compiler/lexical analyzer
- Compiler/syntax analyzer
- Compiler/virtual machine interpreter
- Concurrent computing
- Conditional structures
- Conjugate transpose
- Constrained genericity
- Continued fraction
- Continued fraction/Arithmetic/Construct from rational number
- Convert seconds to compound duration
- Convex hull
- Count in octal
- Count the coins
- Cramer's rule
- Create a file on magnetic tape
- Create an HTML table
- Create an object at a given address
- Cuban primes
- Currency
- Currying
- Cut a rectangle
D
- De Bruijn sequences
- Deal cards for FreeCell
- Death Star
- Deconvolution/2D+
- Deepcopy
- Define a primitive data type
- Delegates
- Deming's Funnel
- Department Numbers
- Determinant and permanent
- Determine if only one instance is running
- Digital root/Multiplicative digital root
- Dijkstra's algorithm
- Dining philosophers
- Discordian date
- Distributed programming
- Doubly-linked list/Definition
- Doubly-linked list/Element definition
- Doubly-linked list/Element insertion
- Doubly-linked list/Traversal
- Draw a clock
- Draw a cuboid
- Draw a pixel
- Draw a rotating cube
- Draw a sphere
- Dutch national flag problem
E
- EKG sequence convergence
- Eban numbers
- Echo server
- Eertree
- Egyptian division
- Egyptian fractions
- Elementary cellular automaton
- Emirp primes
- Empty directory
- Empty string
- Enforced immutability
- Entropy/Narcissist
- Equilibrium index
- Euler's identity
- Euler's sum of powers conjecture
- Events
- Execute Brain****
- Execute HQ9+
- Execute SNUSP
- Execute a Markov algorithm
- Exponentiation order
- Extensible prime generator
F
- FTP
- Factorial base numbers indexing permutations of a collection
- Factors of a Mersenne number
- Farey sequence
- Fibonacci n-step number sequences
- Find largest left truncatable prime in a given base
- Find palindromic numbers in both binary and ternary bases
- Find the intersection of two lines
- Find the last Sunday of each month
- First perfect square in base N with N unique digits
- Fixed length records
- Flipping bits game
- Flow-control structures
- Floyd's triangle
- Floyd-Warshall algorithm
- Forest fire
- Fork
- Formal power series
- Four bit adder
- Four is magic
- Four is the number of letters in the ...
- Fractran
- Function frequency
- Functional coverage tree
- Fusc sequence
G
H
- HTTPS/Authenticated
- HTTPS/Client-authenticated
- Handle a signal
- Harshad or Niven series
- Hash join
- Hello world/Line printer
- Hello world/Newbie
- Here document
- Hickerson series of almost integers
- Hilbert curve
- History variables
- Hofstadter Figure-Figure sequences
- Holidays related to Easter
- Honeycombs
- Horizontal sundial calculations
- Hough transform
- Huffman coding
- Humble numbers
- Hunt The Wumpus
I
- IBAN
- Idiomatically determine all the characters that can be used for symbols
- Idiomatically determine all the lowercase and uppercase letters
- Image convolution
- Image noise
- Imaginary base numbers
- Index finite lists of positive integers
- Inheritance/Multiple
- Integer overflow
- Intersecting Number Wheels
- Inverted index
- Iterated digits squaring
K
L
- LZW compression
- Largest int from concatenated ints
- Largest number divisible by its digits
- Last letter-first letter
- Latin Squares in reduced form
- Law of cosines - triples
- Levenshtein distance
- Linear congruential generator
- Literals/Floating point
- Long primes
- Longest Common Substring
- Longest common subsequence
- Longest increasing subsequence
- Longest string challenge
- Loops/Increment loop index within loop body
- Loops/Wrong ranges
- Loops/with multiple ranges
- Lucky and even lucky numbers
- Ludic numbers
M
- MAC Vendor Lookup
- MD4
- MD5/Implementation
- Machine code
- Mad Libs
- Main step of GOST 28147-89
- Make directory path
- Map range
- Mastermind
- Matrix Digital Rain
- Matrix chain multiplication
- Maximum triangle path sum
- Mayan numerals
- Maze generation
- Maze solving
- McNuggets Problem
- Median filter
- Memory layout of a data structure
- Metaprogramming
- Metered concurrency
- Metronome
- Mian-Chowla sequence
- Middle three digits
- Miller–Rabin primality test
- Minesweeper game
- Modular exponentiation
- Modular inverse
- Morse code
- Move-to-front algorithm
- Multi-dimensional array
- Multiplicative order
- Multisplit
- Munchausen numbers
- Munching squares
N
- N-smooth numbers
- Naming conventions
- Narcissist
- Narcissistic decimal number
- Natural sorting
- Nautical bell
- Negative base numbers
- Nested function
- Nested templated data
- Nim Game
- Nonoblock
- Nonogram solver
- Numeric error propagation
- Numerical and alphabetical suffixes
- Numerical integration/Gauss-Legendre Quadrature
O
P
- Paraffins
- Parallel Brute Force
- Parallel calculations
- Parametric polymorphism
- Parametrized SQL statement
- Parse an IP Address
- Parsing/RPN calculator algorithm
- Parsing/RPN to infix conversion
- Parsing/Shunting-yard algorithm
- Partition an integer X into N primes
- Pascal's triangle/Puzzle
- Password generator
- Pathological floating point problems
- Pattern matching
- Peaceful chess queen armies
- Pell's equation
- Percentage difference between images
- Percolation/Bond percolation
- Percolation/Mean cluster density
- Percolation/Mean run density
- Percolation/Site percolation
- Perfect totient numbers
- Permutations/Derangements
- Permutations/Rank of a permutation
- Permutations by swapping
- Pernicious numbers
- Phrase reversals
- Pig the dice game
- Pig the dice game/Player
- Pinstripe/Display
- Pinstripe/Printer
- Plasma effect
- Pointers and references
- Poker hand analyser
- Polymorphic copy
- Polyspiral
- Population count
- Pragmatic directives
- Primes - allocate descendants to their ancestors
- Primorial numbers
- Problem of Apollonius
- Pythagorean quadruples
- Pythagorean triples
R
- RCRPG
- RIPEMD-160
- RPG Attributes Generator
- RSA code
- Ramer-Douglas-Peucker line simplification
- Random number generator (device)
- Range consolidation
- Ranking methods
- Rare numbers
- Rate counter
- Read a configuration file
- Record sound
- Reflection/Get source
- Reflection/List methods
- Reflection/List properties
- Remove lines from a file
- Rendezvous
- Rep-string
- Resistor mesh
- Respond to an unknown method call
- Retrieve and search chat history
- Rock-paper-scissors
- Rosetta Code/Find bare lang tags
S
- S-Expressions
- SOAP
- SQL-based authentication
- Safe addition
- Safe primes and unsafe primes
- Sailors, coconuts and a monkey problem
- Same Fringe
- Scope/Function names and labels
- Search a list of records
- Secure temporary file
- Self-describing numbers
- Self-referential sequence
- Semiprime
- Semordnilap
- Send an unknown method call
- Sequence: nth number with exactly n divisors
- Sequence: smallest number greater than previous term with exactly n divisors
- Sequence: smallest number with exactly n divisors
- Sequence of primes by trial division
- Sequence of primorial primes
- Set
- Set consolidation
- Set of real numbers
- Set puzzle
- Sexy primes
- Shoelace formula for polygonal area
- Shortest common supersequence
- Sierpinski pentagon
- Simple database
- Singleton
- Singly-linked list/Element definition
- Singly-linked list/Element insertion
- Singly-linked list/Traversal
- Smarandache prime-digital sequence
- Smith numbers
- Sokoban
- Solve a Hidato puzzle
- Solve a Holy Knight's tour
- Solve a Hopido puzzle
- Solve a Numbrix puzzle
- Solve the no connection puzzle
- Sort a list of object identifiers
- Sort numbers lexicographically
- Sorting algorithms/Bead sort
- Sorting algorithms/Heapsort
- Sorting algorithms/Pancake sort
- Sorting algorithms/Patience sort
- Sorting algorithms/Radix sort
- Sorting algorithms/Shell sort
- Sorting algorithms/Sleep sort
- Sorting algorithms/Strand sort
- Soundex
- Sparkline in unicode
- Special characters
- Special variables
- Speech synthesis
- Spelling of ordinal numbers
- Spinning rod animation/Text
- Split a character string based on change of character
- Square-free integers
- Square but not cube
- Stable marriage problem
- Start from a main routine
- State name puzzle
- Straddling checkerboard
- Stream Merge
- String append
- String interpolation (included)
- String matching
- String prepend
- Strip a set of characters from a string
- Strip block comments
- Strip control codes and extended characters from a string
- Strong and weak primes
- Substring/Top and tail
- Subtractive generator
- Successive prime differences
- Sudoku
- Suffixation of decimal numbers
- Sum and Product Puzzle
- Sum to 100
- Superellipse
- Superpermutation minimisation
- Sutherland-Hodgman polygon clipping
- Synchronous concurrency
T
- Table creation/Postal addresses
- Tarjan
- Taxicab numbers
- Temperature conversion
- Terminal control/Clear the screen
- Terminal control/Coloured text
- Terminal control/Cursor movement
- Terminal control/Cursor positioning
- Terminal control/Dimensions
- Terminal control/Display an extended character
- Terminal control/Hiding the cursor
- Terminal control/Inverse video
- Terminal control/Positional read
- Terminal control/Preserve screen
- Terminal control/Unicode output
- Ternary logic
- Test integerness
- Textonyms
- The ISAAC Cipher
- The Name Game
- The Twelve Days of Christmas
- Thiele's interpolation formula
- Tic-tac-toe
- Tokenize a string with escaping
- Tonelli-Shanks algorithm
- Topic variable
- Total circles area
- Totient function
- Tree traversal
- Truncatable primes
- Truncate a file
- Truth table
- Twelve statements
U
V
W
Draft tasks without implementation[edit]
These tasks are drafts, meaning they largely need more work to turn them into full tasks. Perhaps you can help by trying to implement them in R (after all, one of the key requirements for a task being non-draft is multiple implementations, preferably in widely different languages) but be aware that this may be difficult because of lack of definition of the task itself.
2
A
B
C
- Card shuffles
- Chebyshev coefficients
- Check input device is a terminal
- Check output device is a terminal
- Checksumcolor
- Chemical Calculator
- Chernick's Carmichael numbers
- Cheryl's Birthday
- Chess player
- Chess player/Move generation
- Chess player/Program options and user interface
- Chess player/Search and evaluation
- Cipolla's algorithm
- Code segment unload
- Color wheel
- Combinations with repetitions/Square Digit Chain
- Continued fraction/Arithmetic/G(matrix NG, Contined Fraction N)
- Continued fraction/Arithmetic/G(matrix NG, Contined Fraction N1, Contined Fraction N2)
- Create an object/Native demonstration
- Curve that touches three points
- Cycle detection
D
- Damm algorithm
- Data Encryption Standard
- Days between dates
- Decimal floating point number to binary
- Decision tables
- Determine if a string has all the same characters
- Determine if a string has all unique characters
- Determine if two triangles overlap
- Dice game probabilities
- Display a linear combination
- Display an outline as a nested table
- Diversity prediction theorem
- Draw pixel 2
E
F
- Factorions
- Faulhaber's formula
- Faulhaber's triangle
- Feigenbaum constant calculation
- Fermat numbers
- Fibonacci heap
- File extension is in extensions list
- File size distribution
- Find URI in text
- Find duplicate files
- Find first and last set bit of a long integer
- Find the intersection of a line with a plane
- Finite state machine
- Fraction reduction
- Free polyominoes enumeration
- French Republican calendar
G
H
I
L
M
- Magic 8-Ball
- Make a backup file
- Markov chain text generator
- Mayan calendar
- Mersenne primes
- Metallic ratios
- Modular arithmetic
- Monads/List monad
- Monads/Maybe monad
- Monads/Writer monad
- Montgomery reduction
- Morpion solitaire
- Most frequent k chars distance
- Multidimensional Newton-Raphson method
- Multiline shebang
N
O
P
- Palindromic gapful numbers
- Parse EBNF
- Parse command-line arguments
- Particle Swarm Optimization
- Penrose tiling
- Pentomino tiling
- Perceptron
- Perlin noise
- Permutations with repetitions
- Permutations with some identical elements
- Pierpont primes
- Playfair cipher
- Polynomial synthetic division
- Print debugging statement
- Process SMIL directives in XML data
- Proof
R
- Railway circuit
- Ramanujan's constant
- Ramsey's theorem
- Random Latin Squares
- Raster bars
- Read a file character by character/UTF8
- Readline interface
- Recursive descent parser generator
- Reflection/List methods
- Remote agent/Agent interface
- Remote agent/Agent logic
- Remote agent/Simulation
- Resistance Calculator
- Resistance Network Calculator
- Reverse the gender of a string
- Robots
- Rosetta Code/List authors of task descriptions
- Rosetta Code/Rank languages by number of users
- Rosetta Code/Run examples
- Rosetta Code/Tasks sorted by average lines of code
- Rosetta Code/Tasks without examples
- Run as a daemon or service
S
- Safe mode
- Sattolo cycle
- Selective File Copy
- Self-hosting compiler
- Separate the house number from the street name
- Simulated annealing
- Sine wave
- Singly-linked list/Element removal
- Snake
- Snake And Ladder
- Solve a Rubik's Cube
- Solving coin problems
- Sorting Algorithms/Circle Sort
- Sorting algorithms/Cycle sort
- Sorting algorithms/Tree sort on a linked list
- Spoof game
- Starting a web browser
- Stirling numbers of the first kind
- Stirling numbers of the second kind
- Subset sum problem
- Substitution Cipher
- Suffix tree
- Sum data type
- Super-d numbers
T
- Table creation
- Tamagotchi emulator
- Teacup rim text
- Terminal control/Restricted width positional input/No wrapping
- Terminal control/Restricted width positional input/With wrapping
- Tetris
- Text between
- Text to HTML
- Time-based One-time Password Algorithm
- Topological sort/Extracted top item
- Transportation problem
- Tree datastructures
- Two Sum
- Type detection
U
Requiring Attention[edit]
Examples[edit]
These tasks have implementations in R, but somebody, somewhere, decided that the example implementation was faulty or in some other way requiring attention. If you're familiar with the task and language, please consider reviewing/correcting the example and removing the notice.
Other pages[edit]
These are other pages related to R which require attention; with your knowledge and assistance, we can improve the quality of the site's content.
No pages found.
Not Considered[edit]
These tasks are not generally counted toward "unimplemented", as somebody, somewhere, decided that R was inappropriate for these tasks, or implementations of them would be unenlightening. Feel free to try your hand at them anyway.
End of List[edit]
Again, feel free to try your hand at any of the tasks listed on this page.
